# 分辨率与对比度限制：艾里斑

(1)$$\text{最小光斑大小 (艾里斑直径) [} \large{\unicode[arial]{x03BC}} \text{m]} = 2.44 \cdot \lambda \left[ \large{\unicode[arial]{x03BC}} \text{m} \right] \cdot f/ \#$$
##### 图 1: 衍射随成像镜头虹膜关闭(f/#增加)而增加。

f/#波长为520nm时的艾里斑直径 (μm)
1.4 1.78
2 2.54
2.8 3.55
4 5.08
5.6 7.11
8 10.15
11 13.96
16 20.30

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